--- In
Homebrew_PCBs@yahoogroups.com, Alan King <alan@n...> wrote:
>
> Following this idea, I'd be strongly inclined to forget coating
and
> removing, reverse the polarity, and work on point plating the tin
to the
> copper..
>
> Used to use a 12V supply, clip one side to a thin piece of steel,
the
> other side onto a pencil lead from a mechanical pencil, and draw
fairly
> permanent lines on the steel with the charged lead. In fact may
have to
> try this myself today, just skip the tin and draw lines on copper
with
> pencil lead, should be a good enough resist and I'd imagine the
copper
> would work ok in place of the steel..
>
> I should've thought to try this before, I used to do this all the
time
> writing things on small scrap steel pieces just because it's fun to
see
> the sparking and results..
>
> Alan
Wouldn't point tinning take forever by electrolysis?
Would the graphite be dense enough to act as an etch resist? Would be
interested in your test results.
Roger